I had about 600-700 watts going to my IDMAXs 10s and they got loud, so yes anything between 500-1000 watts per will be just fine. I think they're a way better sub than the Alpine and IMO more comparable to a W7 than a W6, and the W6 costs more than the IDMAX does... I mean none of the subs on your list are bad, in the proper enclosure theyll all sound good, I just think for the price I'd personally choose an IDMAX over a W6 AND a W7 any day of the week... but that's just me...
And if you want to save even more $ than I think youd be very satisfied with the Dayton HO's as well...
And like I said before the new SSA Icons seem pretty promising and the ssa store was running a great sale on them where they were down to $279 which is a hell of a price.
Once again just this man's opinion but I'd list them like so.
IDMAX- Best overall sub, extremely accurate, will give you the best sound while still being able to get very loud, most exspensive.
ICON- Loudest of the 3, new design for 2018, sub can get stupid loud, but will sound good doing so.
Dayton HO- Very versatile, can perform very well in small enclosures, totally underrated sub, seems like ppl either love them to death or dont like them... I'd put them in a SQ category of subwoofer, but can get loud and low in sealed or ported applications, best value of the bunch.
I forgot that you also mentioned the FI Q Neo, I dont know much about the Neo line, but the Q has always been a woofer when owned ppl seem to love. American made if that's important to you as well. I like to think of Fi as RE pre 2007, so if you liked/loved the original RE line of subs you prob will like/love Fi...